The researchers studied how farmyard manure, phosphorus, and zinc affect the yield of blackgram and wheat crops in Chhattisgarh. They found that using 5 tonnes of farmyard manure per hectare resulted in higher crop yields. Additionally, applying 17.2 kg of phosphorus per hectare led to the best blackgram yield and highest overall wheat-equivalent yield. Zinc levels did not have a significant impact on crop yields. After three years, the soil showed improved nutrient levels even without farmyard manure.